[%c_effect a5;square;a5;type;GreatFind;persistent;true] Now White gets two passed pawns.
64... d7e6  65. f4g3 Black is in zugzwang. He either has to let the king to f5 or allow the bishop to c7. 65... d8e7  66. g3c7 [%c_effect c7;square;c7;type;GreatFind;persistent;true] 66... e7c5 